PRIORITY - THE CENTER DRIVE SHAFT BEARINGS NEED TO BE INSPECTED FOR CORRECT ADJUSTMENT ON CERTAIN 518 AND 528 SKI DDERS - PI3479 - MAILED US AND CANADA, CACO, COSA, LIMITED COFA
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PRIORITY - THE CENTER DRIVE SHAFT BEARINGS NEED TO BE INSPECTED FOR CORRECT ADJUSTMENT ON CERTAIN 518 AND 528 SKI DDERS - PI3479 - MAILED US AND CANADA, CACO, COSA, LIMITED COFA
NOTE:   The information supplied in this service letter may not be valid after the termination date of this program.   Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
U-168 A-115 AU-108.1 O-128 PRIORITY 3253 PI3479 COMPLETION DATE
Termination Date
February 28, 1991 August 31, 1991
Problem
The bearings on the center drive shaft, inside the oscillating hitch, may not have been adjusted correctly. This can result in a low hour bearing and shaft failure with possible damage to the hitch.
Affected Product
Model Identification Number 518 94U2257-2302 95U2682-2773, 2775-2781, 2783-2786, 2788 528 96C720-740 97C376-387
Parts Needed
Dealers will need to order parts for this Program. ***** 518 Skidders ***** 1 - 7K5425 Shim 1 - 0S1922 Lock ***** 528 Skidders ***** 1 - 4K7294 Lock 1 - 8K5892 Shim
Action Required
See the attached procedure.
Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
***** Machines Being Checked In The Field ***** Caterpillar Dealer Suggested Customer Suggested Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. (D/N) (Sell) (C/L) (Sell) 100% 3 0 0 0 0 NOTE: This is a 3 hour job. ***** Machines In Dealer Inventory ***** Caterpillar Dealer Suggested Customer Suggested Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. (D/N) (Sell) (C/L) (Sell) 100% 2 0 0 0 0 NOTE: This is a 2 hour job.
Parts Disposition
Any parts removed (with the exception of cores used for Caterpillar Remanufactured parts) can be rendered useless and scrapped immediately upon completion of the repair. MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE. Attach. (1-Owner Notification) (2-Rework Procedure) COPY OF
Owner Notification
FOR U.S. AND CANADIAN OWNERS XYZ Corporation 3240 Arrow Drive Anywhere, YZ 99999 PRIORITY - The Center Drive Shaft Bearings Need To Be Inspected For Correct Adjustment On Certain 518 And 528 Skidders MODELS INVOLVED - 518 and 528 Skidders Dear Caterpillar Product Owner: The bearings on the center drive shaft, inside the oscillating hitch, need to be inspected for correct adjustment on the products listed below. The repair will be done at no cost to you. Contact your local Caterpillar dealer immediately and schedule a time to have this service performed. The repair time for this service is approximately three hours. We regret the inconvenience this may cause you, but urge you to have this service performed as soon as possible to prevent unscheduled downtime. Caterpillar Inc. Identification #(s) Attached to August 16, 1990 Service Letter Rework Procedure 1. Follow the procedures in the Disassembly and Assembly section of the Service Manual. If the retaining plate on the rear of the hitch is going to be removed, the front and rear of the machine must be supported as described in the Service Manual. 2. Remove the rear frame bottom guard. 3. Remove the drive shaft that connects the center drive line to the rear axle. 4. Remove the splined sliding drive shaft which connects the center drive line to the front of the machine. This will permit free movement of the center drive shaft within the oscillating hitch. 5. Measure the shaft endplay using a dial indicator with a magnetic base. Move the center drive shaft using a pry bar while measuring the actual endplay. If the endplay is with the following specifications, no other work is necessary. Go to Step 7 to assemble the machine. Model Specifications 518 0.05 - 0.10 mm (.002 - .004") 528 0.03 - 0.08 mm (.001 - .003") 6. If there is excessive endplay (shims have to be removed), adjust the endplay to the specifications given in Step 5. If there is bearing preload and no endplay (shims have to be added), use one of the following steps: A. If the machine is in dealer inventory with very low service hours, make an over-all visual inspection, including the outside of the hitch and seal areas for any signs of heat. Rotate the shaft to check for any rough areas. If problems are not evident, adjust the bearing to the specified bearing clearance. B. If the machine has been put into service and has been operated, look for signs of heat in the hitch area such as grease being thrown out around the shaft. Also, inspect the lip of the 6V3261 Seal (on the 518 Skidder) or 7K5191 Seal on the 528 Skidder for damage caused by heat. (This seal is located in the hitch bore at the center side of the hitch). Excessive heat in this area may also result in a burned grease odor. If there are any signs of excessive heat, the center drive shaft should be removed and the bearings replaced. a) If there are no signs of excessive heat, further inspection is necessary. Install a straight grease fitting, such as a 3B8489 Fitting or a 6L3616 Adapter, in place of the 3B8485 Fitting (518) and 3B8486 Fitting, on the 528 Skidder, located in the hitch pin end of the drive shaft. This will permit the use of a socket wrench to rotate the drive shaft. b) Use an inch-pound torque wrench with a dial to measure the rolling torque of the center drive shaft. Record the reading. A drive shaft with endplay that has been correctly adjusted will require about 30 inch-pounds of torque to rotate the shaft smoothly. If the torque required to turn the shaft is not uniform, or the shaft rotation feels rough, the drive shaft should be removed and the bearings replaced. c) If the shaft rotates smoothly, shim the shaft assembly to obtain the correct endplay measure the rolling torque of the shaft. Compare the rolling torque with the correct endplay to the initial rolling torque. If the rolling torque has decreased by 30 inch-pounds or less, the bearings have not been damaged due to excessive preload. The machine can be assembled. Example: The rolling torque initially measured 45 inch-pounds and then measured 30 inch-pounds after the endplay was adjusted is a decrease of 15 inch-pounds. If the rolling torque has decreased by more than 30 inch-pounds after the endplay has been correctly adjusted, there is a high probability of decreased bearing life and the center drive shaft bearings should be replaced. Example: The rolling torque initially measured 150 inch-pounds and then dropped to 35 inch-pounds after the endplay was adjusted. This is a decrease of 115 inch-pounds. d) Install the original 3B8485 or 3B8486 Grease fitting . 7. Install the splined sliding shaft into the center of the machine and tighten the coupling bolts to the specified torque. 8. Install the drive line connecting the center shaft to the rear axle and tighten the bolts to the specified torque. 9. Install the bottom guards and tighten the bolts to the specified torque. Tighten the bolts to the specified torque twice to prevent the bolts from coming loose and causing damage to the bolts and bottom guard. The specified torques for the bolts are: 5/8" Bolt - 170 lb ft. 3/4" Bolt - 300 lb ft.
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